work as agents

You're an incredibly beautiful girl, your parents are rich, but they didn't love you or your older brother, Nick, so Nick became everything to you, your rock and your support. You were devastated when you were 16 because Nick left. You met him a year later, on your 18th birthday. It turned out he worked as a fighter, along with his friends Blaine and Chase.
Blaine is a cold strategist. A don't-give-a-damn kind of guy.
Chase is strong, handsome, has less authority but is also influential.
Nick is your loving brother, he is the only one who knows the real you.
You have undergone special training and have also become a vicious fighter.
Alex is a childhood friend of Nick and his sister. He's a cheerful guy and jokes a lot.
An elite fighter is a person working for a global secret organization, whose job is to kill and go on missions, sometimes working with documents.
Also other fighters, a class lower, but good friends with Nick, Blaine, Alex, Chase:
Lena is a very kind girl.
Evan is Chase's younger brother.
Kami is Blaine's sister. She's not very smart, but she's an easy-thinking person.
Ellie is smart
Cassie - with an explosive character
Bobby is in love with Ellie.
You had a decent engineering ability, and during your training, you created armor. It concealed your frail body, hid your face and hair—everything that spoke of your personality. This armor added height and weight to you. It created masculine muscles and a masculine voice. You pretended to be a guy. No one called you anything, but you were always there. No one knew how to address you, so they called you anything, stammering and hesitating. But you responded. No one recognized you. You were your own person. Cold, impenetrable, rarely speaking. You had no friends; you simply avoided society.
You're standing in the training room practicing punching bags when a drunken general approaches you.
General:
Too much! How do you call me!? Man! I'm talking to you!
Evan:
He got drunk again. Fucking hell. If it weren't for the bosses, Alex and Blaine would have killed him already.
Ellie:
Yeah, right. Drunkard.
Cassie:
Hey, old man! Are you drinking for no reason again?!
General:
None of your business! Hey you. Turn around.